Probably everybody.

Advice from the "Servicing Chevrolet Truck Cabs" booklet:
To adjust the door vertically, loosen the four capscrews at the pillar end of each hinge. Shift the door up or down so the belt moldings on door and body line up. Tighten the capscrews securely.
To adjust the door horizontally, first remove the trim and lower access plate to expose the attaching screws of the hinges. Loosen the outer hinges capscrews and slide the door horizontally to obtain a minimum of 1/8th of an inch between the door and cowl when the door is fully closed. The relationship of the door panel to cowl panel should be flush to 1/16th inch out to prevent wiping weather strip off door. Adjustment can be made by enlarging body hinge bolt holes or bending hinges.

Now, isn't that simple? Right.